CN104404191A - Casting technology of wear-resistant low-porosity cable bridge stand - Google Patents
Casting technology of wear-resistant low-porosity cable bridge stand Download PDFInfo
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- CN104404191A CN104404191A CN201410622558.3A CN201410622558A CN104404191A CN 104404191 A CN104404191 A CN 104404191A CN 201410622558 A CN201410622558 A CN 201410622558A CN 104404191 A CN104404191 A CN 104404191A
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Abstract
The invention discloses a casting technology of a wear-resistant low-porosity cable bridge stand. The casting ingredient is composed of the following components in percentage by weight: 80 to 90% of carbon steel and 10 to 20% of iron scrap; wherein the carbon steel is composed of the following chemical elements in percentage by weight: 0.33% of C, 0.87% of Mn, 0.77% of Si, 0.033% of P, 0.032% of S, 0.72% of Cr, 0.82% of Ni, 0.44% of Mo, and the balance being Fe and impurities. The tensile strength of the bridge stand can reach 690 MPa, the break elongation rate reaches 18.20%, the end face shrinkage can reach 38%, the yield point elongation percentage reaches 45.4 J, and the yield point elongation rate reaches 880 MPa. The provided casting technology can largely improve the wear resistant property and toughness of the cable bridge stand, reduce the porosity of the cable bridge stand, and prolong the service life of the cable bridge stand, and moreover the operation is simple.
Description
Technical field
The present invention relates to a kind of casting technique of wear-resisting low pore cable testing bridge.
Background technology
In prior art, higher cable testing bridge can be required as antagonism corrosive wear resistance, often in use there is following disadvantage: bear frictional wear especially in impact frictional wear situation at it, easily there is the phenomenon that surface layer peels off in its surface, thus cause serious wear, secondly, because the price comparison of rich chromium cast iron itself is high, improve the cost of whole technique; A kind ofly can overcome above-mentioned defect tool and to have good wearability and namely the cable testing bridge casting technique of surperficial low pore becomes those skilled in the art's technical problem urgently to be resolved hurrily.
Summary of the invention
Goal of the invention: the object of the invention is the casting technique in order to provide a kind of wear-resisting low pore cable testing bridge, greatly can improve wear resistance and the toughness of cable testing bridge, reduces the pore on cable testing bridge, extends the work-ing life of cable testing bridge, and simple to operate.
In order to solve the problems of the technologies described above, the present invention devises a kind of casting technique of wear-resisting low pore cable testing bridge, comprises the following steps:
Step (1): be that molding material makes casting mold with molding sand, before making casting mold, is first placed in baker by the molding sand in molding material and dries, at the chromite resin sand that the hair side portion of casting mold coating 50mm is thick;
Step (2): according to carbon steel: 80-90%, the ratio allotment casting batching of iron filings: 10-20%;
Employing iron filings instead of the pig iron in former spheroidal graphite cast iron raw material, and relative to the high price cost of the pig iron, the price of iron filings is cheaper, greatly reduces the economic benefit that cost improves whole technique;
The selection of casting batching strictly controls food ingredient, carbon steel: 80-90%, and iron filings: 10-20% ensure the quality of casting batching; Ensure the consolidation of casting batching according to the principle of lower tight upper pine, be conducive to conduction and magnetic conduction like this, enhance productivity;
Step (3): it is original iron melt that carbon steel and iron filings are successively added melting in electric furnace according to the principle of lower tight upper pine, smelting temperature is 1600 DEG C, progressively increasing circuit power in fusion process, and often carry out smashing material operation, in original iron melt, add copper, the mass percentage of copper is the 0.9-1.1% of casting batching total amount simultaneously;
Add a small amount of copper in original iron melt, copper can improve hardening capacity, meanwhile, owing to adding copper, refine pearlite and graphite, the thin section spoken parts in traditional operas of minimizing, improves big cross section structure sensitive properties; Mechanical property improves product strength, hardness, toughness; Use properties improves the wear resistance of product, thermotolerance agent corrodibility, meanwhile, improves the density of product;
Step (4): original iron melt adds nodulizing agent after coming out of the stove and carries out spheroidizing in nodularization bag, and after spheroidizing reacion terminates, the slag making of spreading perlite is to purify original iron melt on original iron melt;
Step (5): utilize original iron melt to be cast into cable testing bridge work in-process in casting mold, the duration of pouring is no more than 2min, teeming temperature is 1380-1400 DEG C;
Step (6): cable testing bridge work in-process carried out successively anneal, quench, temper;
Step (7): the work in-process after tempering are carried out twice Shot Blasting, namely completes casting, and inspection warehouse-in.
Restriction technical scheme of the present invention is:
Further, the casting technique of aforesaid wear-resisting low pore cable testing bridge, in carbon steel, Chemical Composition mass percent is: C:0.30-0.37%, Mn:0.70-1.00%, Si:0.60-0.90%, P:0.033-0.035%, S:0.032-0.035%, Cr:0.040-0.090%, Ni:0.60-0.90%, Mo:0.40-0.50%, all the other are Fe and impurity.
The casting technique of aforesaid wear-resisting low pore cable testing bridge, in carbon steel, Chemical Composition mass percent is: C:0.33%, Mn:0.87%, Si:0.77%, P:0.033%, S:0.032%, Cr:0.72%, Ni:0.82%, Mo:0.44%, all the other are Fe and impurity;
The selection of carbon steel in the present invention, ensure that tensile strength reaches 690/Mpa, elongation after fracture reaches 18.20%, end face shrinking percentage reaches 38%, yield point elongation rate unit elongation reaches 45.4J, and elongation at yield point reaches 880/Mpa, and the properties of cable testing bridge is greatly improved.
The casting technique of aforesaid wear-resisting low pore cable testing bridge, in step (4), nodulizing agent is magnesium ferro-silicon or rare elements nodulizing agent, and the nodulizing agent quality added is 1.4% of casting batching quality, and the nodularization time is 55-60s.
The casting technique of aforesaid wear-resisting low pore cable testing bridge, step (5) adds a small amount of alterant to original iron melt in casting cycle, and the Chemical Composition mass percent of alterant is: rare earth silicon 85%, aluminium ingot 5%, bismuth ingot 4%, magnesium ingot 6%;
Metamorphism treatment energy fining austenite grains, strong deoxidation and sulphur removal and significantly purify original iron melt, passivation crystal boundary, reduce carbide to assemble, containing aluminium ingot and bismuth ingot in alterant of the present invention, aluminum hull plays desoxydatoin to reduce rare earth consumption and stable modification effect, bismuth is the nucleating agent of carbide, magnesium is the element of strong stable carbide, and have the effect of stronger deoxidation, desulfidation and stable modification effect, and the iron liquid boiling caused owing to reacting fierceness is also of value to the absorption of alterant and the purification of original iron melt.
The casting technique of aforesaid wear-resisting low pore cable testing bridge, being specifically treated to of step (6):
A anneals: by cable testing bridge work in-process stove heat to 920-940 DEG C and blowing out after being incubated 3-4h, stove is cooled to 400-450 DEG C, opens fire door subsequently and continues slow cooling to 250-300 DEG C of air cooling of coming out of the stove to room temperature;
B quenches: cable testing bridge work in-process slow stove heat after annealing is incubated 0.5-1h to 580-590 DEG C, and stove heat uses Water spray fast cooling after 550-620 DEG C again;
C tempering: the product after quenching is at room temperature entered stove again and stove heat to 240-255 DEG C after be incubated 1-1.5h after to come out of the stove air cooling;
Tempering, quenching, namely the over-all properties that the thermal treatment of annealing can improve product has hardness and also has certain toughness outward, the determination of thermal treatment temp should to obtain even and tiny austenite crystal for principle, to obtain tiny martensitic stucture after quenching, growing up of austenite crystal is directly proportional to quenching temperature, Water spray product fast cooling is adopted during quenching, and in time temper is carried out to product, the stress produced when can not only eliminate quenching, the tempered martensite of some amount can also be obtained, ensure that the high rigidity of product turn improves the toughness of product simultaneously.
The casting technique of aforesaid wear-resisting low pore cable testing bridge, at cable testing bridge surface-coated silicone resin high-temperature resistant coating after the middle Shot Blasting of step (7), the each constituent mass percentage fractional of silicone resin high-temperature resistant coating is: boron modification silicone resin: 45-58%, heat-resisting color stuffing: 35-45%, auxiliary agent: 2%-4%, wherein, boron modification silicone resin is boric acid modified silicone resin or epoxide modified silicon boron resin;
Heat-resisting color stuffing comprises:
Nano silicon, isolation-type functional stuffing and aluminium powder and the mass ratio of nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1;
Isolation-type functional stuffing comprises following component according to the mass fraction:
Hollow glass micropearl: 3-6 part, graphite: 11-15 part, black silicon carbide: 21-35 part, fine-grained alumina: 26-30 part, molybdenumdisulphide: 6-11 part, zinc oxide: 3-5 part, talcum powder: 3-6 part;
Molybdenumdisulphide, graphite, talcum powder is adopted in isolation-type functional stuffing, graphite material makes it easily produce slippage due to distinctive crystalline structure, graphite metal to-metal contact lubricant has adsorptivity simultaneously, one deck lubricant film (graphite crystal film) can be formed, play the effect reducing frictional wear, there is good thermal diffusivity and thermal conductivity;
Auxiliary agent is for comprise following component according to the mass fraction:
Dispersion agent: 11-15 part, wetting agent: 2-6 part, solidifying agent 22-50 part, matting agent: 3-6 part, film coalescence aid: 6-10 part, thickening material: 6-10 part, Natvosol: 6-10 part, pH adjusting agent: 2-5 part, silane coupling agent: 40-60 part;
Graphite and molybdenumdisulphide are mixed use, graphite and molybdenumdisulphide have good synergistic effect, both are the wear resisting property that effectively can improve coating used in combination in certain proportion, reduce wear weight loss and frictional coefficient, in coating, add a certain amount of antimonous oxide simultaneously, effectively can strengthen the hardness of paint coatings, and improve the wear resistance of coating;
Nano silicon is due to roughly the same with the basic structure of base-material; particle diameter is also less; can be filled in the gap of resin binder better; even can become a resin binder network structure part; good supplementary function is had to the heat-resisting three dimensional structure of high-crosslinking-degree; make resin can form the SiO2 refractory protection of one deck fine heat-resisting performance when decomposes, prevent the continuation of inner layer resin base-material to decompose, can give paint film better thermostability.
The casting technique of aforesaid wear-resisting low pore cable testing bridge, in step (7), twice Shot Blasting shot used is of a size of 0.5MM.
Embodiment
embodiment 1
Present embodiments provide a kind of casting technique of wear-resisting low pore cable testing bridge, comprise the following steps:
Step (1): be that molding material makes casting mold with molding sand, before making casting mold, is first placed in baker by the molding sand in molding material and dries, at the chromite resin sand that the hair side portion of casting mold coating 50mm is thick;
Step (2): according to carbon steel: 80-90%, the ratio allotment casting batching of iron filings: 10-20%; In carbon steel, Chemical Composition mass percent is: C:0.30-0.37%, Mn:0.70-1.00%, Si:0.60-0.90%, P:0.033-0.035%, S:0.032-0.035%, Cr:0.040-0.090%, Ni:0.60-0.90%, Mo:0.40-0.50%, all the other are Fe and impurity;
Employing iron filings instead of the pig iron in former spheroidal graphite cast iron raw material, and relative to the high price cost of the pig iron, the price of iron filings is cheaper, greatly reduces the economic benefit that cost improves whole technique;
The selection of casting batching strictly controls food ingredient, carbon steel: 80-90%, and iron filings: 10-20% ensure the quality of casting batching; Ensure the consolidation of casting batching according to the principle of lower tight upper pine, be conducive to conduction and magnetic conduction like this, enhance productivity;
Step (3): it is original iron melt that carbon steel and iron filings are successively added melting in electric furnace according to the principle of lower tight upper pine, smelting temperature is 1600 DEG C, progressively increasing circuit power in fusion process, and often carry out smashing material operation, in original iron melt, add copper, the mass percentage of copper is the 0.9-1.1% of casting batching total amount simultaneously;
Add a small amount of copper in original iron melt, copper can improve hardening capacity, meanwhile, owing to adding copper, refine pearlite and graphite, the thin section spoken parts in traditional operas of minimizing, improves big cross section structure sensitive properties; Mechanical property improves product strength, hardness, toughness; Use properties improves the wear resistance of product, thermotolerance agent corrodibility, meanwhile, improves the density of product;
Step (4): original iron melt adds nodulizing agent after coming out of the stove and carries out spheroidizing in nodularization bag, and nodulizing agent is magnesium ferro-silicon or rare elements nodulizing agent, and the nodulizing agent quality added is 1.4% of casting batching quality, the nodularization time is 55-60s; After spheroidizing reacion terminates, on original iron melt, the slag making of spreading perlite is to purify original iron melt;
Step (5): utilize original iron melt to be cast into cable testing bridge work in-process in casting mold, add a small amount of alterant to original iron melt in casting cycle, the Chemical Composition mass percent of alterant is: rare earth silicon 85%, aluminium ingot 5%, bismuth ingot 4%, magnesium ingot 6%; The duration of pouring is no more than 2min, and teeming temperature is 1380-1400 DEG C;
Step (6): cable testing bridge work in-process carried out successively anneal, quench, temper;
Step (7): the work in-process after tempering are carried out twice Shot Blasting, namely completes casting, and inspection warehouse-in.
embodiment 2
Present embodiments provide a kind of casting technique of wear-resisting low pore cable testing bridge, comprise the following steps:
Step (1): be that molding material makes casting mold with molding sand, before making casting mold, is first placed in baker by the molding sand in molding material and dries, at the chromite resin sand that the hair side portion of casting mold coating 50mm is thick;
Step (2): according to carbon steel: 80-90%, the ratio allotment casting batching of iron filings: 10-20%; In carbon steel, Chemical Composition mass percent is: C:0.33%, Mn:0.87%, Si:0.77%, P:0.033%, S:0.032%, Cr:0.72%, Ni:0.82%, Mo:0.44%, and all the other are Fe and impurity;
Employing iron filings instead of the pig iron in former spheroidal graphite cast iron raw material, and relative to the high price cost of the pig iron, the price of iron filings is cheaper, greatly reduces the economic benefit that cost improves whole technique;
The selection of casting batching strictly controls food ingredient, carbon steel: 80-90%, and iron filings: 10-20% ensure the quality of casting batching; Ensure the consolidation of casting batching according to the principle of lower tight upper pine, be conducive to conduction and magnetic conduction like this, enhance productivity;
Step (3): it is original iron melt that carbon steel and iron filings are successively added melting in electric furnace according to the principle of lower tight upper pine, smelting temperature is 1600 DEG C, progressively increasing circuit power in fusion process, and often carry out smashing material operation, in original iron melt, add copper, the mass percentage of copper is the 0.9-1.1% of casting batching total amount simultaneously;
Add a small amount of copper in original iron melt, copper can improve hardening capacity, meanwhile, owing to adding copper, refine pearlite and graphite, the thin section spoken parts in traditional operas of minimizing, improves big cross section structure sensitive properties; Mechanical property improves product strength, hardness, toughness; Use properties improves the wear resistance of product, thermotolerance agent corrodibility, meanwhile, improves the density of product;
Step (4): original iron melt adds nodulizing agent after coming out of the stove and carries out spheroidizing in nodularization bag, and nodulizing agent is magnesium ferro-silicon or rare elements nodulizing agent, and the nodulizing agent quality added is 1.4% of casting batching quality, the nodularization time is 55-60s; After spheroidizing reacion terminates, on original iron melt, the slag making of spreading perlite is to purify original iron melt;
Step (5): utilize original iron melt to be cast into cable testing bridge work in-process in casting mold, add a small amount of alterant to original iron melt in casting cycle, the Chemical Composition mass percent of alterant is: rare earth silicon 85%, aluminium ingot 5%, bismuth ingot 4%, magnesium ingot 6%; The duration of pouring is no more than 2min, and teeming temperature is 1380-1400 DEG C;
Step (6): cable testing bridge work in-process carried out successively anneal, quench, temper;
A anneals: by cable testing bridge work in-process stove heat to 920-940 DEG C and blowing out after being incubated 3-4h, stove is cooled to 400-450 DEG C, opens fire door subsequently and continues slow cooling to 250-300 DEG C of air cooling of coming out of the stove to room temperature;
B quenches: cable testing bridge work in-process slow stove heat after annealing is incubated 0.5-1h to 580-590 DEG C, and stove heat uses Water spray fast cooling after 550-620 DEG C again;
C tempering: the product after quenching is at room temperature entered stove again and stove heat to 240-255 DEG C after be incubated 1-1.5h after to come out of the stove air cooling;
Step (7): the work in-process after tempering are carried out twice Shot Blasting, at cable testing bridge surface-coated silicone resin high-temperature resistant coating after Shot Blasting, the each constituent mass percentage fractional of silicone resin high-temperature resistant coating is: boron modification silicone resin: 45-58%, heat-resisting color stuffing: 35-45%, auxiliary agent: 2%-4%, wherein, boron modification silicone resin is boric acid modified silicone resin or epoxide modified silicon boron resin;
Heat-resisting color stuffing comprises:
Nano silicon, isolation-type functional stuffing and aluminium powder and the mass ratio of nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1;
Isolation-type functional stuffing comprises following component according to the mass fraction:
Hollow glass micropearl: 3-6 part, graphite: 11-15 part, black silicon carbide: 21-35 part, fine-grained alumina: 26-30 part, molybdenumdisulphide: 6-11 part, zinc oxide: 3-5 part, talcum powder: 3-6 part;
Molybdenumdisulphide, graphite, talcum powder is adopted in isolation-type functional stuffing, graphite material makes it easily produce slippage due to distinctive crystalline structure, graphite metal to-metal contact lubricant has adsorptivity simultaneously, one deck lubricant film (graphite crystal film) can be formed, play the effect reducing frictional wear, there is good thermal diffusivity and thermal conductivity;
Auxiliary agent is for comprise following component according to the mass fraction:
Dispersion agent: 11-15 part, wetting agent: 2-6 part, solidifying agent 22-50 part, matting agent: 3-6 part, film coalescence aid: 6-10 part, thickening material: 6-10 part, Natvosol: 6-10 part, pH adjusting agent: 2-5 part, silane coupling agent: 40-60 part; Twice Shot Blasting shot used is of a size of 0.5MM; Complete casting, and inspection warehouse-in.
These are only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a casting technique for wear-resisting low pore cable testing bridge, is characterized in that, comprise the following steps:
Step (1): be that molding material makes casting mold with molding sand, before making casting mold, is first placed in baker by the molding sand in molding material and dries, at the chromite resin sand that the hair side portion of casting mold coating 50mm is thick;
Step (2): according to carbon steel: 80-90%, the ratio allotment casting batching of iron filings: 10-20%;
Step (3): it is original iron melt that carbon steel and iron filings are successively added melting in electric furnace according to the principle of lower tight upper pine, smelting temperature is 1600 DEG C, progressively increasing circuit power in fusion process, and often carry out smashing material operation, in original iron melt, add copper, the mass percentage of copper is the 0.9-1.1% of described casting batching total amount simultaneously;
Step (4): original iron melt adds nodulizing agent after coming out of the stove and carries out spheroidizing in nodularization bag, and after spheroidizing reacion terminates, the slag making of spreading perlite is to purify original iron melt on original iron melt;
Step (5): utilize original iron melt to be cast into cable testing bridge work in-process in casting mold, the duration of pouring is no more than 2min, teeming temperature is 1380-1400 DEG C;
Step (6): cable testing bridge work in-process carried out successively anneal, quench, temper;
Step (7): the work in-process after tempering are carried out twice Shot Blasting, namely completes casting, and inspection warehouse-in.
2. the casting technique of wear-resisting low pore cable testing bridge according to claim 1, it is characterized in that, in carbon steel, Chemical Composition mass percent is: C:0.30-0.37%, Mn:0.70-1.00%, Si:0.60-0.90%, P:0.033-0.035%, S:0.032-0.035%, Cr:0.040-0.090%, Ni:0.60-0.90%, Mo:0.40-0.50%, all the other are Fe and impurity.
3. the casting technique of wear-resisting low pore cable testing bridge according to claim 2, it is characterized in that, in carbon steel, Chemical Composition mass percent is: C:0.33%, Mn:0.87%, Si:0.77%, P:0.033%, S:0.032%, Cr:0.72%, Ni:0.82%, Mo:0.44%, all the other are Fe and impurity.
4. according to the casting technique of the wear-resisting low pore cable testing bridge described in claim 1, it is characterized in that, in step (4), nodulizing agent is magnesium ferro-silicon or rare elements nodulizing agent, and the nodulizing agent quality added is 1.4% of described casting batching quality, and the nodularization time is 55-60s.
5. the casting technique of wear-resisting low pore cable testing bridge according to claim 1, it is characterized in that, step (5) adds a small amount of alterant to original iron melt in casting cycle, the Chemical Composition mass percent of described alterant is: rare earth silicon 85%, aluminium ingot 5%, bismuth ingot 4%, magnesium ingot 6%.
6. the casting technique of wear-resisting low pore cable testing bridge according to claim 1, is characterized in that, being specifically treated to of step (6):
A anneals: by cable testing bridge work in-process stove heat to 920-940 DEG C and blowing out after being incubated 3-4h, stove is cooled to 400-450 DEG C, opens fire door subsequently and continues slow cooling to 250-300 DEG C of air cooling of coming out of the stove to room temperature;
B quenches: cable testing bridge work in-process slow stove heat after annealing is incubated 0.5-1h to 580-590 DEG C, and stove heat uses Water spray fast cooling after 550-620 DEG C again;
C tempering: the product after quenching is at room temperature entered stove again and stove heat to 240-255 DEG C after be incubated 1-1.5h after to come out of the stove air cooling.
7. the casting technique of wear-resisting low pore cable testing bridge according to claim 1, it is characterized in that, at cable testing bridge surface-coated silicone resin high-temperature resistant coating after the middle Shot Blasting of step (7), the each constituent mass percentage fractional of described silicone resin high-temperature resistant coating is: boron modification silicone resin: 45-58%, heat-resisting color stuffing: 35-45%, auxiliary agent: 2%-4%, wherein, boron modification silicone resin is boric acid modified silicone resin or epoxide modified silicon boron resin;
Described heat-resisting color stuffing comprises:
Nano silicon, isolation-type functional stuffing and aluminium powder and the mass ratio of described nano silicon, isolation-type functional stuffing and aluminium powder is 1.5:1:1;
Described isolation-type functional stuffing comprises following component according to the mass fraction:
Hollow glass micropearl: 3-6 part, graphite: 11-15 part, black silicon carbide: 21-35 part, fine-grained alumina: 26-30 part, molybdenumdisulphide: 6-11 part, zinc oxide: 3-5 part, talcum powder: 3-6 part;
Described auxiliary agent is for comprise following component according to the mass fraction:
Dispersion agent: 11-15 part, wetting agent: 2-6 part, solidifying agent 22-50 part, matting agent: 3-6 part, film coalescence aid: 6-10 part, thickening material: 6-10 part, Natvosol: 6-10 part, pH adjusting agent: 2-5 part, silane coupling agent: 40-60 part.
8. the casting technique of wear-resisting low pore cable testing bridge according to claim 1, it is characterized in that, in step (7), twice Shot Blasting shot used is of a size of 0.5MM.
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| CN107674307A (en) * | 2017-10-29 | 2018-02-09 | 江苏鼎荣电气集团有限公司 | A kind of composite fireproof anti-corrosion cable bridge and preparation method thereof |
| CN108662291A (en) * | 2018-05-28 | 2018-10-16 | 倍德力能源装备（江苏）有限公司 | A kind of high-performance cross arm type constant supporting spring hanger and its processing technology |
| CN108796366A (en) * | 2018-06-01 | 2018-11-13 | 江苏华强电力设备有限公司 | A kind of high strength steel cable testing bridge |
| CN108977734A (en) * | 2018-06-10 | 2018-12-11 | 江苏中讯电力科技有限公司 | A kind of steel high-strength cable bridge |
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| CN108796366A (en) * | 2018-06-01 | 2018-11-13 | 江苏华强电力设备有限公司 | A kind of high strength steel cable testing bridge |
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| CN109023090A (en) * | 2018-09-10 | 2018-12-18 | 镇江朝阳机电科技有限公司 | A kind of alloy reinforced plastic cable bridge frame and preparation method thereof |
| CN111215577A (en) * | 2019-11-26 | 2020-06-02 | 山西晋武能源有限公司 | Production process of stirring pot before molding of cast briquette |
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